<template>
  <div class="wrapper">

        <!-- header部分 -->
        <header>
            <p>商家信息</p>
        </header>

        <!-- 商家logo部分 -->
        <div class="business-logo">
            <img :src="business.businessImg">
        </div>

        <!-- 商家信息部分 -->
        <div class="business-info">
            <h3>{{business.businessName}}</h3>
            <p>&#165;{{business.startPrice}}起送 &#165;{{business.deliveryPrice}}配送</p>
            <p>{{business.businessExplain}}</p>
        </div>

        <!-- 食品列表部分 -->
        <ul class="food">
            <li v-for="(item,index) in foodArr" >
                <div class="food-left">
                    <img :src="item.foodImg">
                    <div class="food-left-info">
                        <h3>{{item.foodName}}</h3>
                        <p>{{item.foodExplain}}</p>
                        <p>&#165;{{item.foodPrice}}</p>
                    </div>
                </div>
                <div class="food-right">
                    <div>
                        <i class="fa fa-minus-circle" @click="minus(index)" v-show="item.quantity!=0">
                        </i>
                    </div>
                    <p><span v-show="item.quantity!=0">{{item.quantity}}</span></p>
                    <div>
                        <i class="fa fa-plus-circle" @click="add(index)"></i>
                    </div>
                </div>
            </li>
        </ul>

        <!-- 底部购物车部分 -->
        <div class="cart">
            <div class="cart-left">
                <div class="cart-left-icon" :style="totalQuantity==0?'background-color:#505051;':'background-color:#3190E8;'">
                    <i class="fa fa-shopping-cart"></i>
                    <div class="cart-left-icon-quantity" v-show="totalQuantity!=0">{{totalQuantity}}</div>
                </div>
                <div class="cart-left-info">
                    <p>&#165;{{totalPrice}}</p>
                    <p>另需配送费{{business.deliveryPrice}}元</p>
                </div>
            </div>

            <div class="cart-right">
                <!-- 不够起送费 -->
                <!-- <div class="cart-right-item">&#165;10起送</div> -->
                <div class="cart-right-item" v-show="totalSettle<business.startPrice" style="background-color: #535356 ; cursor: default;">
                    &#165;{{business.startPrice}}起送
                </div>
                <!-- 够起送费 -->
                <div class="cart-right-item" @click="toOrder" v-show="totalSettle>=business.startPrice">
                    去结算
                </div>
            </div>
        </div>
    </div>
</template>

<script>
export default {
    name: 'BusinessInfo',
    data() {
        return {
            businessId: this.$route.query.businessId,
            business: {},
            foodArr: [],
            user: {}
        }
    },
    created() {
        this.user = this.$getSessionStorage('user');
        //根据businessId查询商家信息
        this.$axios.post('BusinessController/getBusinessById',this.$qs.stringify({
                businessId: this.businessId
        })).then(response => {
            this.business = response.data;
        }).catch(error => {
            console.error(error);
        });

        //根据businessId查询所属食品信息
        this.$axios.post('FoodController/listFoodByBusinessId',this.$qs.stringify({
            businessId: this.businessId
        })).then(response => {
            this.foodArr = response.data;
            for(let i = 0; i < this.foodArr.length; i++) {
                this.foodArr[i].quantity = 0;
            }

            //如果已登录，那么需要去查询购物车中是否已经选购了某个食品
            if(this.user != null) {
                this.listCart();
            }
        }).catch(error => {
            console.error(error);
        })
    },
    methods: {
        listCart() {
            this.$axios.post('CartController/listCart',this.$qs.stringify({
                businessId: this.businessId,
                userId: this.user.userId
            })).then(response => {
                let cartArr = response.data;
                //遍历所有食品列表
                for (let foodItem of this.foodArr) {
                    foodItem.quantity = 0;
                    for (let cartItem of cartArr) {
                        if (cartItem.foodId == foodItem.foodId) {
                            foodItem.quantity = cartItem.quantity;
                        }
                    }
                }
                this.foodArr.sort();
            }).catch(error => {
                console.error(error);
            });
        },
        add(index) {
            //首先做登录验证
            if (this.user == null) {
                this.$router.push({
                    path: '/login'
                });
                return;
            }

            if (this.foodArr[index].quantity == 0) {
                //做insert
                this.savaCart(index);
            } else {
                //做update
                this.updateCart(index,1);
            }
        },
        minus(index) {
            //首先做登录验证
            if (this.user == null) {
                this.$router.push({
                    path: '/login'
                });
                return;
            }
            if(this.foodArr[index].quantity > 1) {
                //做update
                this.updateCart(index,-1);
            } else {
                //做delete
                this.removeCart(index);
            }
        },
        savaCart(index) {
            this.$axios.post('CartController/saveCart',this.$qs.stringify({
                businessId:this.businessId,
                userId:this.user.userId,
                foodId:this.foodArr[index].foodId
            })).then(response => {
                if (response.data == 1) {
                    //此食品数量更新为1
                    this.foodArr[index].quantity = 1;
                    this.foodArr.sort();
                } else {
                    alert('向购物车添加食品失败！');
                    // alert(userId);
                }
            }).catch(error => {
                console.error(error);
            })
        },
        updateCart(index, num) {
            this.$axios.post('CartController/updateCart',this.$qs.stringify({
                businessId: this.businessId,
                userId: this.user.userId,
                foodId: this.foodArr[index].foodId,
                quantity: this.foodArr[index].quantity + num
            })).then(response => {
                if (response.data == 1) {
                    //此食品数量更新为1或-1
                    this.foodArr[index].quantity += num;
                    this.foodArr.sort();
                } else {
                    alert('向购物车中更新食品失败！');
                }
            }).catch(error => {
                console.error(error);
            });
        },
        removeCart(index) {
            this.$axios.post('CartController/removeCart',this.$qs.stringify({
                businessId: this.businessId,
                userId: this.user.userId,
                foodId: this.foodArr[index].foodId
            })).then(response => {
                if(response.data == 1) {
                    //此食品数量要更新为0；视图的减号和数量要消失
                    this.foodArr[index].quantity = 0;
                    this.foodArr.sort();
                } else {
                    alert('从购物车中删除食品失败！');
                }
            }).catch(error => {
                console.error(error);
            })
        },
        toOrder() {
            this.$router.push({
                path: '/orders',
                query: {
                    businessId: this.business.businessId
                }
            });
        }
    },
    computed: {
        //食品总价格
        totalPrice() {
            let total = 0;
            for (let item of this.foodArr) {
                total += item.foodPrice * item.quantity;
                
            }
            return total;
        },
        //食品总数量
        totalQuantity() {
            let quantity = 0;
            for (let item of this.foodArr) {
                quantity += item.quantity;
            }
            return quantity;
        },
        //结算总价格
        totalSettle() {
            return this.totalPrice + this.business.deliveryPrice;
        }
    }
}
</script>

<style scoped>
/* 总容器 */
.wrapper {
    width: 100%;
    height: 100%;
}

/* header */
.wrapper header {
    width: 100%;
    height: 12vw;
    background: #0097FF;
    color: #FFF;
    font-size: 4.8vw;

    position: fixed;
    left: 0;
    top: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

/* 商家logo部分 */
.wrapper .business-logo {
    width: 100%;
    height: 35vw;
    margin-top: 12vw;

    display: flex;
    justify-content: center;
    align-items: center;
}
.wrapper .business-logo img {
    width: 40vw;
    height: 30vw;
    border-radius: 5px;
}

/* 商家信息部分 */
.wrapper .business-info {
    width: 100%;
    height: 20vw;

    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}
.wrapper .business-info h3 {
    font-size: 5vw;
    /* color: #555; */
}
.wrapper .business-info p {
    font-size: 3vw;
    color: #666;
    margin-top: 1vw;
}
/* 食品列表部分 */
.wrapper .food {
    width: 100%;
    margin-bottom: 14vw;
}
.wrapper .food li {
    width: 100%;
    box-sizing: border-box;
    padding: 2.5vw;
    user-select: none;
    /* border-bottom: 1px solid #000; */

    display: flex;
    justify-content: space-between;
    align-items: center;
}
.wrapper .food li .food-left {
    display: flex;
    /* justify-content: left; */
    align-items: center;
}
.wrapper .food li .food-left img {
    width: 20vw;
    height: 20vw;
}
.wrapper .food li .food-left .food-left-info {
    margin-left: 3vw;
}
.wrapper .food li .food-left .food-left-info h3 {
    font-size: 3.8vw;
    color: #555;
}
.wrapper .food li .food-left .food-left-info p {
    font-size: 3vw;
    color: #888;
    margin-top: 2vw;
}

.wrapper .food li .food-right {
    width: 16vw;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.wrapper .food li .food-right .fa-minus-circle {
    font-size: 5.5vw;
    color: #999;
    cursor: pointer;
}
.wrapper .food li .food-right p {
    font-size: 3.6vw;
    color: #333;
}
.wrapper .food li .food-right .fa-plus-circle {
    font-size: 5.5vw;
    color: #0097EE;
    cursor: pointer;
}

/* 购物车部分 */
.wrapper .cart {
    width: 100%;
    height: 14vw;

    position: fixed;
    left: 0;
    bottom: 0;

    display: flex;
}
.wrapper .cart .cart-left {
    flex: 2;
    background-color: #505051;
    display: flex;
}
.wrapper .cart .cart-left .cart-left-icon {
    width: 16vw;
    height: 16vw;
    box-sizing: border-box;
    border: 1.6vw solid #444;
    border-radius: 8vw;
    background-color: #3190E8;
    font-size: 7vw;
    color: #FFF;

    display: flex;
    justify-content: center;
    align-items: center;

    margin-left: 3vw;
    margin-top: -4vw;

    position: relative;
}
.wrapper .cart .cart-left .cart-left-icon-quantity {
    width: 5vw;
    height: 5vw;
    border-radius: 2.5vw;
    background-color: red;
    color: #fff;
    font-size: 3.6vw;

    display: flex;
    justify-content: center;
    align-items: center;

    position: absolute;
    right: -1.5vw;
    top: -1.5vw;
}

.wrapper .cart .cart-left .cart-left-info p:first-child {
    font-size: 4.5vw;
    color: #fff;
    margin-top: 1vw;
}
.wrapper .cart .cart-left .cart-left-info p:last-child {
    font-size: 2.8vw;
    color: #AAA;
}
.wrapper .cart .cart-right {
    flex: 1;
}
.wrapper .cart .cart-right .cart-right-item {
    /* 不够起送费 */
    /* background-color: #535356; */
    /* cursor: none */
    background-color: #38CA73;
    width: 100%;
    height: 100%;
    color: #fff;
    font-size: 4.5vw;
    font-weight: 700;
    user-select: none;
    cursor: pointer;

    display: flex;
    justify-content: center;
    align-items: center;
}
</style>